A flexible voltage regulating device for power distribution network

Abstract

This utility model belongs to the field of early warning technology, specifically relating to a flexible voltage regulation device for power distribution networks, comprising: a rectifier circuit, a regulation module, and an inverter. The regulation module includes an APFC circuit and a pulse compensation circuit. The input terminal of the APFC circuit is connected to the output terminal of the rectifier circuit, and the output terminal of the APFC circuit is connected to the input terminal of the pulse compensation circuit. The output terminal of the pulse compensation circuit is connected to the inverter. The pulse compensation circuit includes a bandpass filter circuit and a linear transformer. The bandpass filter circuit amplifies the voltage signal, extracts secondary ripple, and processes the ripple to reduce the ripple of the output voltage. The linear transformer is used for voltage isolation, thereby helping to reduce the output voltage ripple and significantly improve the dynamic performance of the circuit to improve voltage quality.

Description

Technical Field

[0001] This utility model belongs to the field of early warning technology, and specifically relates to a flexible voltage regulating device for power distribution networks. Background Technology

[0002] With economic development and improved living standards, electricity load is increasing daily, leading to more stringent requirements for power supply voltage. Current technologies often address low power factor and severe grid harmonic pollution by rectifying the voltage of the distribution network and then using an APFC (Active Power Factor Correction) circuit control system to correct the power factor of the rectified DC voltage. However, the APFC circuit control system suffers from a low voltage loop bandwidth in order to suppress the second harmonic of the output voltage. This results in poor dynamic performance of the voltage loop in the power factor correction (PFC) circuit, leading to large output voltage ripple. Summary of the Invention

[0003] In order to solve the technical problems existing in the background art, the present invention provides a flexible voltage regulating device for power distribution networks, which helps to reduce voltage ripple and thus improve the output voltage quality.

[0004] To achieve the above technical solution, this utility model provides a flexible voltage regulation device for power distribution networks, comprising: a rectifier circuit, a regulation module, and an inverter. The regulation module includes an APFC circuit and a pulse compensation circuit. The input terminal of the APFC circuit is connected to the output terminal of the rectifier circuit, and the output terminal of the APFC circuit is connected to the input terminal of the pulse compensation circuit. The output terminal of the pulse compensation circuit is connected to the inverter. The pulse compensation circuit includes a bandpass filter circuit and a linear transformer. The bandpass filter circuit is used to amplify the voltage signal, extract the secondary ripple, and process the ripple to reduce the ripple of the output voltage; the linear transformer is used for voltage isolation.

[0005] Furthermore, the pulse compensation circuit includes: a first capacitor C1, the first end of which is connected to a first input terminal, the first end of a first resistor R1, and the first end of the primary side of a linear transformer T1; and a second end of the first capacitor C1 is connected to a second input terminal, the first end of a second resistor R2, the first end of a fourth resistor R4, the first end of the secondary side of the linear transformer T1, the first end of a fifth resistor R5, and a second output terminal. The second terminal of the first resistor R1 is connected to the first terminal of the second capacitor C2, the second terminal of the second resistor, and the first terminal of the third capacitor C3; the second terminal of the second capacitor C2 is connected to the first terminal of the third resistor R3 and the output terminal of the operational amplifier U1; the second terminal of the third capacitor C2 is connected to the second terminal of the third resistor R3 and the positive input terminal of the operational amplifier U1; the positive input terminal of the operational amplifier U1 is connected to the second terminal of the fourth resistor R4; the output terminal of the operational amplifier U1 is connected to the second terminal of the secondary side of the linear transformer T1. The second terminal of the primary side of the linear transformer T1 is connected to the first terminal and the first output terminal of the sixth resistor R6; the second terminal of the sixth resistor R6 is connected to the second terminal of the fifth resistor R5.

[0006] Furthermore, the operational amplifier chip U1 is an LM358 chip.

[0007] The beneficial effects of this utility model are: By using a ripple compensation circuit, the output voltage ripple is significantly reduced, and the dynamic performance of the circuit is significantly improved, thereby enhancing voltage quality.

[0008] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0009] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0010] Figure 1 This is a circuit control system diagram of an APFC (Analog-Powered Controller) for a flexible voltage regulating device in a power distribution network, as shown in one embodiment. Figure 2 This is a circuit diagram of a pulsation compensation circuit according to one embodiment. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, each technical and scientific term used in this embodiment has the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0013] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0014] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0015] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For researchers or maintenance personnel in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0016] Example 1: like Figure 1 As shown, this embodiment provides a flexible voltage regulation device for a power distribution network, including: a rectifier circuit, a regulation module, and an inverter. The regulation module includes an APFC circuit and a pulse compensation circuit. The input terminal of the APFC circuit is connected to the output terminal of the rectifier circuit, and the output terminal of the APFC circuit is connected to the input terminal of the pulse compensation circuit. The output terminal of the pulse compensation circuit is connected to the inverter. The pulse compensation circuit includes a bandpass filter circuit and a linear transformer. The bandpass filter circuit is used to amplify the voltage signal, extract the secondary ripple, and process the ripple to minimize the ripple of the output voltage. The linear transformer is used for voltage isolation.

[0017] like Figure 2 As shown, the pulsation compensation circuit includes: a first capacitor C1, the first end of the first capacitor C1 being connected to the first input terminal, the first end of the first resistor R1 and the first end of the primary side of the linear transformer T1; the second end of the first capacitor C1 being connected to the second input terminal, the first end of the second resistor R2, the first end of the fourth resistor R4, the first end of the secondary side of the linear transformer T1, the first end of the fifth resistor R5 and the second output terminal. The second terminal of the first resistor R1 is connected to the first terminal of the second capacitor C2, the second terminal of the second resistor, and the first terminal of the third capacitor C3; the second terminal of the second capacitor C2 is connected to the first terminal of the third resistor R3 and the output terminal of the operational amplifier U1; the second terminal of the third capacitor C2 is connected to the second terminal of the third resistor R3 and the positive input terminal of the operational amplifier U1; the positive input terminal of the operational amplifier U1 is connected to the second terminal of the fourth resistor R4; the output terminal of the operational amplifier U1 is connected to the second terminal of the secondary side of the linear transformer T1. The second terminal of the primary side of linear transformer T1 is connected to the first terminal and the first output terminal of the sixth resistor R6; the second terminal of the sixth resistor R6 is connected to the second terminal of the fifth resistor R5. The operational amplifier chip U1 is an LM358 chip.

[0018] By using a ripple compensation circuit, the output voltage ripple is significantly reduced, and the dynamic performance of the circuit is noticeably improved, thereby enhancing voltage quality.

[0019] The same or similar parts between the various embodiments in the specification can be referred to interchangeably. In particular, for the terminal embodiments, since they are basically similar to the method embodiments, the description and comparison are simple, and the relevant parts can be referred to the description in the method embodiments.

[0020] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0021] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flexible voltage regulating device for power distribution networks, comprising a rectifier circuit, a regulating module, and an inverter, characterized in that, The adjustment module includes an APFC circuit and a pulse compensation circuit; the input terminal of the APFC circuit is connected to the output terminal of the rectifier circuit, and the output terminal of the APFC circuit is connected to the input terminal of the pulse compensation circuit. The output of the pulse compensation circuit is connected to the inverter; The pulse compensation circuit includes a bandpass filter circuit and a linear transformer. The bandpass filter circuit is used to amplify the voltage signal, extract the secondary ripple, and process the ripple to reduce the ripple of the output voltage. Linear transformers are used for voltage isolation; The pulse compensation circuit includes: a first capacitor C1, the first end of which is connected to a first input terminal, the first end of a first resistor R1 and the first end of the primary side of a linear transformer T1; and a second end of the first capacitor C1 is connected to a second input terminal, the first end of a second resistor R2, the first end of a fourth resistor R4, the first end of the secondary side of the linear transformer T1, the first end of a fifth resistor R5 and a second output terminal. The second terminal of the first resistor R1 is connected to the first terminal of the second capacitor C2, the second terminal of the second resistor, and the first terminal of the third capacitor C3; the second terminal of the second capacitor C2 is connected to the first terminal of the third resistor R3 and the output terminal of the operational amplifier U1; the second terminal of the third capacitor C2 is connected to the second terminal of the third resistor R3 and the positive input terminal of the operational amplifier U1; the positive input terminal of the operational amplifier U1 is connected to the second terminal of the fourth resistor R4; the output terminal of the operational amplifier U1 is connected to the second terminal of the secondary side of the linear transformer T1. The second terminal of the primary side of the linear transformer T1 is connected to the first terminal and the first output terminal of the sixth resistor R6; the second terminal of the sixth resistor R6 is connected to the second terminal of the fifth resistor R5.

2. The flexible voltage regulating device for power distribution networks according to claim 1, characterized in that, The operational amplifier U1 uses the LM358 chip.

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